[Amps] Question for All Amp Builders...

jeff millar jeff at wa1hco.net
Fri Feb 20 15:41:13 PST 2009


Scott...

I learned a lot about practical RF network design from using a 
computerized Smith chart program.  Those programs let you play around 
with values and explore results in seconds.  You don't need to actually 
do any of the computations or Smith Chart construction techniques, just 
vary the values of components and drive end point of the lines on the 
chart to 50 Ohms. 

http://tools.rfdude.com/RFdude_Smith_Chart_Program/RFdude_smith_chart_program.html

This works for output networks, input networks, VHF amps with tuned 
lines, etc.

jeff, wa1hco



KB0NLY wrote:
> Thank's for all the replies guys!
>
> I'm going to sit down with the handbook and some other stuff i printed off 
> last night and let it all soak in.  If its one thing i like to do its learn, 
> that's why when i saw all the designs online i knew i could build them, but 
> i want to know how they came up with the design in the first place to better 
> understand it!  I like being more than an appliance operator.. HI HI
>
> 73,
>
> Scott KBØNLY
> www.kb0nly.net
>
>
>
>
> ----- Original Message ----- 
> From: "Bob Maser" <bmaser at tampabay.rr.com>
> To: "KBØNLY" <kb0nly at mchsi.com>; <amps at contesting.com>
> Sent: Friday, February 20, 2009 9:14 AM
> Subject: Re: [Amps] Question for All Amp Builders...
>
>
>   
>> You have to calculate the plate load impedance of the tube(s) that you 
>> plan
>> to use. plate voltage/(1.8 * plate amps).  You then take the PLI and in 
>> the
>> ARRL Handbook they list what C1,L1,C2 you need for each band.
>> Another alternative is to use a computer program to calculate the
>> capacitances and inductance.
>>
>> Bob  W6TR
>> ----- Original Message ----- 
>> From: "KBØNLY" <kb0nly at mchsi.com>
>> To: <amps at contesting.com>
>> Sent: Friday, February 20, 2009 4:13 AM
>> Subject: [Amps] Question for All Amp Builders...
>>
>>
>> Got a question for everyone...
>>
>> When designing an amp how do you determine the value of the tune and load
>> capacitor?  I have been looking at a lot of designs online for HF and 6M,
>> i'm currently working on building a 6M myself from a YU1AW design.
>>
>> Just seems to me there has to be some solid logic behind the values that
>> these guys put down when they design the schematic for it.
>>
>> 73,
>>
>> Scott KBØNLY
>>
>> www.kb0nly.net
>>     
>



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